Your iPhone is designed to back itself up to iCloud automatically every single night while you sleep. But if you wake up to a persistent “iCloud Backup Failed” notification on your lock screen, your precious photos and text messages are no longer safe.
iCloud backups usually fail for one of three reasons: a lack of storage space, a weak Wi-Fi connection, or a corrupted backup file blocking the new one. Here is how to fix an iCloud backup that keeps failing.
1. The “Golden Rule” of iCloud Backups
Before you dig into the settings, you must understand the three physical requirements for an automatic iCloud backup to occur. If even one of these is missing, the backup will fail:
- The iPhone must be connected to Wi-Fi.
- The iPhone must be plugged into a charger.
- The iPhone’s screen must be locked.
If you have been falling asleep while watching YouTube videos with your screen unlocked, or if your charging cable is loose, the backup will never trigger. Ensure all three conditions are met tonight.
2. Free Up Cloud Space (Or Buy More)
The most common reason a backup fails is simply because you have run out of your allotted iCloud storage space (Apple only gives you 5GB for free).
- Go to Settings > [Your Name] > iCloud.
- Look at the colorful storage bar. If it is entirely full, your backup cannot proceed.
You have two choices. You can tap “Manage Account Storage” and delete old photos and massive iMessage videos to get your usage under 5GB. Or, you can tap “Upgrade to iCloud+” and pay a small monthly fee for 50GB or 200GB of storage, which instantly solves the problem.
3. Delete the Corrupted Previous Backup
Sometimes, your iPhone has plenty of storage space and a great Wi-Fi connection, but the backup still fails at 99%. This happens when the previous backup file stored on Apple’s servers became corrupted, and your iPhone refuses to overwrite it.
The solution is to delete the old, broken backup and force the iPhone to create a brand new one from scratch.
- Go to Settings > [Your Name] > iCloud.
- Tap Manage Account Storage.
- Tap Backups.
- Tap on the name of your current iPhone.
- Scroll to the very bottom and tap Delete & Turn Off Backup. (Do not worry, this only deletes the copy in the cloud, it does not delete anything currently on your physical phone).
- Go back to the main iCloud menu, tap iCloud Backup, and toggle the switch back to the On position.
- Tap the blue Back Up Now button.
Because it is building the file from scratch, this manual backup will take significantly longer than usual. Leave your phone plugged in and do not use it until the progress bar completes.
4. Reset Network Settings
If the manual backup still fails with an “estimation time remaining” that never moves, your iPhone’s Wi-Fi antenna might be struggling to maintain a stable upload connection with your router.
Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. This will erase all your saved Wi-Fi passwords, so you will need to reconnect to your home network, but it often cures persistent upload failures.